Percussion tool



May 6 1924. 1,493,187v

E. M. BENTLEY PERCUSSION TooL Filed March 5. 1920 Patented May 6, 1924.

UNITED STATES PATENT EDWARD M. BENTLEY, 0F LAWRENCE, NEW YORK.

PERCUSSION IOO'L.

Application led March 3, 1920. Serial No. 363,072.

To .all whom t may concern.'

Be it known that I, EDWARD M. BENTLEY, a citizen of the. United States, residing at Lawrence, ycounty of Nassau, and State of New York, have invented certain new and useful Improvements in Percussion Tools,

the following being a full, clear, and exactv K disclosure of the one form of my invention l"which I at present deem preferable.

For a detailed Vdescriptionofthe present.

form of my invention, reference .may be had to the following specification and to the accompanying drawing, :which illustrates my invention, wherein" Fig. l shows an axial section of my device, f

v Fig. 2 a transverse section on the line 14-1, Figs. 3, 4 and 5 show details and Fig. 6 shows a modification. A My tool is of the type wherein a spring is periodically tensioned andV released toy y operate the impact member of the tool.

Referring to the drawing, M represents an electric motor and D a worm driven thereby through a detachable connection.l

The worm has ball bearings at E and a thrust bearing at F and Vdrivestwo worm wheels G and I-I carried by shafts V, mounted in strut bars K, K projecting forward from a diaphragm L. A spring N is containedV between a base K1 on struts K, "K

4 and a Hange K2 on the impact member S.

t spring N. When pins R, lR reach the deadi Each worm wheel has a concentricy slot d formed in it as shown in Fig. 5 in which lits a pin R projecting from a crank disc.l

A carried by the shaft V. On the opposite side of each disc A is a wrist-pin W from kwhich a connecting rod P leads to one side ofthe fiange Kzvwhere it is pivoted to one of the ears 7c, lc. l

Assuming the worm wheels to be kept in rotation by the motor, the pins R, R willy be periodically caught by the rear ,ends of therespective curved slots d and rotated approximately 180 degrees, thereby drawing up connecting rods P, P and compressing center point the reaction of the springs, now relieved of their tension, cause the pins to travel toward the forward ends of the slots d, causing discs A, A, to run ahead of the worm wheels and allow the springs to throw the member S against the tool O. Care should be exercised that the impact of the hammer is taken up by the tool, or,

4observed that the- 'spring in the tensioning direction only,

yin the absenceof the tool, by the casing, ,instead -of by the connecting rods P, P.

Those vrods are slotted to allow them to over-run the lmember S, by virtue of the longer stroke of the crank .when the memberis arrested by its impact on the tool. After each impact thev pins R, `R are again picked upby the worm wheels and the de-`= scribed action is repeated. It will be cranks ,actuate' the but exert Ano drivingeffect thereon 'in the other` direction since at that time` the force of the,l gear wheels on the crank is released. y'The one-way( drive of the crank vby the gear wheel mayy be lsecured by spring ,pawls' T, T onthe wheel engaging a ratchet )on (the periphery of disc A, which in that case is contained in a circular recess in the gear wheel. By this means the gear wheel `more quickly picks up the crank disc after the latter has run ahead'of the former.

What I claim as new and desire tovse- `cure by Letters Patent is:

1. A percussion tool comprising anim-` pact member, an operating springtherefor, a drive gear, tensioning means including rotatable ,members operatively connected with the spring, and lmeans'vperiodically couplingthe drive gear and the tensioning means together, whereby the spring is tensioned and released.

' 2,'A percussion tool comprising` an impact member, an operatingy spring therefor,

a drive gear, meansfor continuously operating said drive gear in one direction, a crank disk'operatively connected with said gspring, and means periodically coupling the drive gear and crank disk together, whereby the spring is tensioned and released.

3. lA percussionv tool comprising an impact member, an operating spring therefor,

with said spring, and means periodicallyy connecting and disconnecting said motor and said crank.

7. A percussion tool comprising in com-v l bination any impact member, an operating spring therefor, a rotatable drive shaft, a speed reducing gear driven thereby, and a rotary connecting device between said spring and saidgear and movable independently of the gear, said connecting device and said gear having complemental means adaptedto release the connecting device von reaching dead center.

8. A percussion tool comprising in comybination an impact member, an operating spring therefor, a rotatable drive shaft, `a speed reducing gear driven thereby, a rotary connecting device between said spring and said gear and movable independently of the gear, said connecting device andsaid gear having complemental means adapted to release the connecting device on reaching dead center, and means whereby said connecting device and gear arecaused to reconnect at the end of the impact stroke.

9. A percussion tool comprising an impact member, an operating spring'therefor, a motor, a crank, a connecting rod yengaging said crank and having a loose connection with said spring, and means periodically connecting and disconnecting said motor and said crank. p

l0. A percussion tool comprising an impact member, an operating spring. therefor, a crank connected with the spring, agear, and a driving connection between the crank and the gear operative in the direction for tensioning the spring.

11. A percussion tool comprising an impact member, an operating spring therefor, a slotted drive gear, and a crank connecting with the spring and having a pin engaging with the slot of said drive gear.

12. A percussion tool compris-ing an impact member, an operating springtherefor, a crank, a drive gear, means providing a lost motion connection between the crank and the drive gear, and means providing a lost-motion connection between the crank and the spring.

13. A percussion tool comprising an impact member, an operating spring therefor, a crank disk, a drive gear, means providing a lost motion connection between the crank disk and the drive gear, and a slotted connecting rod between the crank disk and the spring.

14:. A percussion tool comprising an impact member, an operating spring therefor, a pair of cranks operatively connected to said spring for tensioning the same, andv means periodically actuating the cranks to apply tension to the spring. y f

15. A percussion tool comprising/animpactA member, an operating spring therefor, a pair of cranks on opposite sides of said spring, a motor, operatingvconnectio'ns between the motor and the cranks, and con# nections between the cranks and the spring.

16. A percussion tool comprising an impact member, an operating spring therefor, a tensioning member, means connecting the tensioning member and spring, and a worm gear operatively connected with said` tensioning means.'

17. A percussion tool comprising-an im,- pact member, a springtherefor, a motor, a pair of worm gears on opposite sides of the motor shaft and driven thereby, a "pair of operating .members between each ofthe respective gears `and the spring, and. means whereby said operating members are period-v ically actuated.

18. A percussion tool comprising an impact member, an operating spring therefor,

a worm gear, means connected with the spring andperiodically engaged with the worm gear for tensioning said spring, a moe" tor for actuatingsaid worm gear, and a detachable connection between Vthe motor and the worm gear. j

19. A percussion tool comprising an impact member, an operating spring therefor,

a motor, a crank shaft driven by the motor, a drive gear ron said shaft having a Vone-wayl slipl connection with said crank shaft, andmeans providing a; loose connection betweenk the spring and said crank shaft.

20. A percussion tool comprising an impact member, an operating spring therefor, a rotatablev member, a motor driving said ,rotatable member, a rotatable crank member having a one-way connection with the lirst mentioned rotatable member, and means providing a reciprocating connection between said crank member and said spring.

21. A percussion tool comprising an impact member, lan `,operating spring therefor, a worm gear, a motor driving saidworm gear, a crank having a one-way connection' with said worm gear, and an operating connection between said crank and the spring for periodically tensioning the latter.

r22. A percussion tool comprising an limpact member, a spring therefor, a gear wheel, an electric motor driving said gear wheel, a crank member enclosed by said 1,493,187 v y I By gear wheel, a one-way connection device beoperatively connected with the spring for tween said crank member and the enclosing tensioning the same and a dead-centered 10 gear wheel and a reciprocating device condevice for periodically connecting said nectng said crank shaft and the spring for screw and the sprin i 5 periodically tensioning it. Signed at New vork city, county and 23. A percussion tool comprising an i111- State of New York, this 5th day of Febpact member, an operating spring therefor, ruary, 1920. a motor, a screw driven by the motor and EDWARD M. BENTLEY. 

